Improvement in sewing-machines



W. PEARSON. SEWING MACHINE.

No. 26,201. Patented Nov. 22, 1859.

Inventor.

UNITED STATES PATENT OFFICE.

WILLIAM PEARSON, OF WINDSOR LOCKS, CONNECTICUT.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 26.20 I, dated November22, 185.9.

To an whom it may concern Be it known that 1, WILLIAM PEARSON, ofWindsor Looks, in the county of Hartford and State of Connecticut, haveinvented certain Improvements in Sewing-Machines, the construction andoperation of which- Ihave described in the following specification andillustrated in its accompanying drawings with sufiicient clearness toenable competent and skillful workmen in the arts to which it pertainsor is most nearly allied, to make and use my invention.

My said invention consists in the combination, with the vibrating looperand with the cam-flange by which it is operated, of a vibrating bar orhanger which carries two friction-rollers, and is attached to thelooper' or the arm of the looper by a pivot the axial line of which islocated midway between the friction-rollers, by which the saidfrictionrollers are made capable of adjusting themselves to theinclination of the cam-flange, and are thus prevented from binding uponit, while at'the same time they are allowed to come up snugly, andthusprevent loss of motion, as hereinafter more fully set forth.

My invention is illustrated in the accompa nying drawings, as follows:

Figure 1 is a side elevation of my machine. Fig. 2 is an end view. Fig.3 is aplan.

Fig. 4 is an under side view. Fig. 5 is a de tail view, showing moreclearly the construction of the looper and the attachment to it of thevibrating bar which carries the frictionrollers. It is an under sideView. Fig. 6 is also a detail under side view, showing the looper andthe cam-flange which operates it in connection. Fig. 7 shows the looperand its attachments as viewed from the right-hand side of Fig. 5, and isan elevation. Fig. 8 is a view in elevation from the opposite side. Fig.9 is a section taken through the center of the mainshaft of the machine,and shows more .clearly the mode of attaching the friction-rollers tothe looper, and the m'annerin which they operate in connection with thecam-flange by which they are driven.

A is the-bed of the machine. B is the main shaft. 0 is the needle-beam,and D is the arm which carries the pressure-pad.

The thread is supplied to the needle and looper from the spools E and F.

f is the needle, and g is the curved part of the looper, which curvedpart is secured in the part G by means of a set-screw, h. The part G is.hung upon a pivot, 2', upon which the whole looper vibrates. The part gis so curved thatits inner surface will coincide with a circle struckfrom the center of the axis i, and the needle is so arranged inconnection with it that it will descend within the curve of the looper,while at the same time the. arrangement of the looper upon an axis uponthe opposite sideof the needle from the axis upon which the needle-beamvibrates allows the looper, while so arranged as to bring the needlewithin its curve, to also itself vibrate within the curveof the needle,by which arrangement both are made, in connection with each other, totake the stitch with the utmost facility.

I is a small spring thread-carrier, which supports the lowerthreadbetween the spool andthe looper, It is intended to be sufficientlyflexible to yield to any undue strain upon the thread.

H is the fiangecam by which motion is given to the looper. The workingpart of this cam works between two friction-rol]ers, j j which are hungupon pins in the vibrating bar 'J, which is attached to the part G by apivot k, upon which it is permitted to vibrate. It is obvious that ifthe friction-rollers were not allowed to change their relative positionto the looper bar or part G, the varying inclinations of the cam-flangefrom a direct circumferential line would make it necessary to leaveconsiderably more room between the rollers than simply the thickness ofthe cam-flange,

or else the obliquity of direction between the rollers which the camwould have in portions of its movement would cause-the parts to bind,and; this evil would be increased by the obliquity given tothe positionof the rollers toward the limit of vibration of the looper in eitherdirection. It is for the purpose of overcoming this difiiculty that Iattach the friction-rollers and vibrating bar in the manner described,so as to allow them to assume any position which the relative directionof thecam-flange may require to allow the parts to Work freely, and yetWithout allowing play or causing the parts to bind in any part of themovement, and without making the cam-flange of an 'ununiform thickness.-I

The particular improvement which I claim as constituting the saidinvention, and originally and first invented'by me, is-- v Thecombination of the vibrating looper, the

cam-flange which operates it, and the vibrating bar J, carrying thefriction-rollers j j, the parts being' constructed, combined, andarranged substantially as and for the purposes set forth.

) WILLIAM- PEARSON. .Witnesses: 7

(1H; 0. DEXTER, R. KENDALL. 1

